Bonding drill



June 18, 1929. R. ROSTRON 1,717,626

BONDING DRILL Original Filed Jan. 26, 1924 2 Sheets-Shet 1 June 18, 1929. RQSTRQN 1,717,626

BONDING DRILL Original Filed Jan. 26, 1924 2 Sheets-Sheet 2 a 2 g E Patented June 18 1929.

UNITED. STATES noenn'r ROSTRON, or cnIene LLInoIs, assrenen r CREE-AR, Annmsja 00., or U cnroseo, ILLINOIS, A conroanrron OFILLINOIS. I

BGNDING DRILL.

Application filed January 26, 1924,'Serial This invention relates to track drills and the like and has forits objectthe production of a track drill of lightweight, sturdy and durable construction, and which may be readily adjusted to meet all requirements of serv ice without the need of wrenches or other tools and withoutpossibility of the parts accidentallymoving from adjusted relation.

Another important object of the invention is the provisionpof means for protecting a drill bit in the drill against damage when the drill is not in use. 7

Numerous other objects and advantages of the invention will be apparentas the same is better understood from the following description, which, taken with the drawings,

discloses a preferred embodiment of said in.

. vention.

Referring to the drawings:

Figure 1 isa side elevation of arail drill embodying my present invention;

,Fig. 2 is an end viewthereof; 1

Fig. 3 is a detail view of the partof the drill clamp which engages the housing members;and r Fig. 4 is a section taken substantiallyon the line 4-4 of Fig. 3. I "a I For the purpose of illustrating my present invention I haveshown on the drawings a preferred embodiment of it. Reference character 11 representsacombined main hous ing and post casting. 1 Reference character 12 is the main housing part of this member and with a bottom plate 13 constitutes the drill;

or transmission housing. It may be stated that gearing is provided within this housing to advance the drill bit and to give to it different speeds as may be desired. This gearing is not shown upon the drawing since itforms no part of the present invention. A rotating spindle 14 is driven thereby and extends forwardly out of the housing and carries a bit socket or sleeve 15 in which'is' mounted the drill bit 16. Reference character 17 indicates an upwardly extending post carrying a handle 18 and a shaft socket or bearing 19. A shaft 21 is fixed in this socket or hearing and on this shaft is mounted a No. 688,643. Renewed November 9,1928.

arser or-rice.)

ribs 25, 26, 27, etc., and openings 28, 29, etc., are PlOVlClGLl to'produce a light, sturdy construction; I 1

:llhedi-ill'is adapted to bekclamped. tothe rail 31-by two aws 32 and 33. One of. these ]i-\VS,33, is carried by a plate 84 adapted to be fixedinadjusted relation upon a forward plate member 35ofthe casting 11,'as will'be presentlydescribedl The other jaw 32 is in tegral with an arm 36 pivotedupon a stud IS'T cXtending forwardly from the top of the platc34, a nut 38 holding thearm tothe stud. A; second and longer stud 39 extends out from the'plate .34 and just above the jaws 32 and This stud passes through anenlargement or aw body 41. and a spring 42 is interposed between this body and the plate A hand lever 43 is mounted upon the stud 39 and has cam surfaces engaging similar surfaceson the body 41, these companion surfaces being indicated by reference character 44. A thumb or wing nut 45 is engaged with the stud 39 beyond thelever43. I 1 I The clamp is operated by adjusting the jaws, whenthey are free ofthe rail, through manipulation of the nut 45 so theyfit nicely and merely freely over the rail part and then after thus positioned the lever 43 is moved to tightly engage the jaws therewith. This lever when manipulated to clamping positionis frictionally held in place because of the-pressureexerted on the cam faces and because there is considerable roughness in the surfaces comprising these cam faces; Obviously the lever may be clampingly held in this position by the operatorif desired.

The plate 34 is adjustable vertically with of the plate 35 whereby to insure true verti- I calmovement of the plate 34 up and down on plate 35. In addition, I have provided an adjustableengaging means between plates f 34-and 35tohold said plates in various positions of adjustment. This positiveeng'age ment consists in thepresent instance of teeth or serrations 47} and 48 on the engaging faces respectively of the plate members. Two bolts 49 are threaded into the plate 35 and extend through slots51 in the plate 34. lVing nuts 52 are or may be provided upon the ends of the bolts to be turned down by hand to hold the teeth or serrations in firm engagement after adjustment. The teeth 47 and 48 are PIGfBltbiYSO constructed that when engaged they do not prevent full contact between the bearing surfaces between the two plates. It will be manifest that both adjustment to proper clamping relation between the jaws aged'when the drill is not iniservice, through a. tendency'of the apparatus to tilt to theleft -viewing Fig. .1, I provide a protector ar j ranged to co-operate with the housing to support the drill bit free of contact with the supporting surface; In the present instance this protectorconsists oftwo legs 55 extending down upon opposite sides of the bit and formed integral with the casting 11.

.It' is thought that the inventionand .many

ofitsv attendant advantages will be understood from the'foregoing description, and it will be apparent that various changes may be made in thefor1n,'construct1on and arrangement of the parts without departlng from the spirt and scope of the invention, or sacrificing all of ltsmaterial advantages, the form hereinbefore described being merely a preferred embodiment V I ClZLHn': V v I 1. An apparatus for 'drllling rails compristhereof.

ring a drill frame, adrill rotatablymounted thereon, saiddrill frame having an upstanding face provided with serrations, a platehav- 7 ing, corresponding serrationsadapted adjustably to engagesaid frame, clamping means for holding said plate in adjusted position on said frame, a clamping jaw carried by the lower portion of said plate, a stud projecting outwardly from the upper end of said plate, a clamping arm carried by said stud, a lower "stud projecting outwardly from the lower portion of said plate and passing through a clamping jaw and said plate, said second clamping jaw having a cam surface thereon, a lever on said lower stud provided with a cam surface adapted to cooperate with the cam surface on said clamping aw, and an adjusting nut on said lower stud adapted to form a rigidbacking forsaid lever.v v

2. In an apparatusfor drilling rails the combination of a drill frame, a rotatable drill carried thereby, said drill frame having a substantially vertical faces provided with vertical, spaced apart shoulders forming guideways and a'series of spaced apart teeth disposed intermediate said shoulders, anda plate having'vertical guideways adapted to fit in saidshoulders,said plate having corresponding teeth adapted to adjustably engage the teeth of said frame, said plate also having vertical slots on either side of said teeth, threaded bolts passingthrough said slots and into said frame, wing nuts adapted toengage said bolts to clamp said plate in adjusted position on said frame, the top of said plate having an outstanding stud and the bottom of said plate having an outstanding bolt and an outstanding clamping jaw, an arm mounted on said upper bolt and depending therefrom in spaced relation from said plate, the lower portion of said arm having, a complementary'clamping jaw and a perforated hub posed between said plate and said hub por tion of said clamping arm;

n ROBERT ROSTRONQ 

